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Re: Minimizing input/output latency ?
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Re: Minimizing input/output latency ?


  • Subject: Re: Minimizing input/output latency ?
  • From: William Stewart <email@hidden>
  • Date: Tue, 19 Apr 2005 12:45:41 -0700


On 19/04/2005, at 11:45 AM, Stéphane Letz wrote:


Le 19 avr. 05, à 20:10, William Stewart a écrit : <deleted blah blah blah> ;-)

Thanks a lot Bill, I think this is exactly what I needed...

In my case where an IO callback uses the output buffer computed at the *previous* cycle, i have an almost constant and low IO processing cost, something like:

- read Input buffers
- do some minimal processing (that I can guaranty to be time bounded in my application because actual processing is done in another thread)
- write output buffers from the previous cycle.


Thus I should be able to use an I/OUsage value that almost exactly represent what percentage of the IO cycle my application cycle represent, in this case a *low* I/OUsage and it should gain almost one entire buffer size latency...

Is this correct?

Yes, exactly.


Are we allowed to ask specific questions on Tiger now ((-: ?

of course not

Bill

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References: 
 >Minimizing input/output latency ? (From: Stéphane Letz <email@hidden>)
 >Re: Minimizing input/output latency ? (From: David Duncan <email@hidden>)
 >Re: Minimizing input/output latency ? (From: William Stewart <email@hidden>)
 >Re: Minimizing input/output latency ? (From: Stéphane Letz <email@hidden>)

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